Just install the plugin, set up the accounts for the users like anything else and make sure that you can access it from outside. Works just like outlook webmail if you will. You're just logging in through the web. So each user just uses their login account. Now there may be a bit more to it in omv with more than one user, so you may want to test that first because I'm not sure if they will all go into the same webdav folder or not if you use the individual home folder option which I think I saw somewhere. I don't use that so it may depend on how that's setup. I attached the image of the webdav in omv, it looks like you may be able to add all the different shares, but again, you will need to play with that as I don't have more than on and only set it up for me to test it.
How is the performance of webdav? Looking through posts here, it looks
like its not nearly as well supported as samba. I still need robust file
permissions and user/pass authentication, which a post from 2015 says
isn't supported yet?
Could you link me to some further reading on how I can set up webdav
with user/pass authentication and setting read/write permissions on a
per-user and per-share basis?